[rtems commit] m68k/gen68340: Add per-section compilation and linking support.

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    005fc1a5ba7f4121448d2a197a5902751097d71c
Changeset: http://git.rtems.org/rtems/commit/?id=005fc1a5ba7f4121448d2a197a5902751097d71c

Author:    Ralph Holmes <ralph at ybden.com>
Date:      Sat Jan 23 02:07:34 2016 +0000

m68k/gen68340: Add per-section compilation and linking support.

The size of the sample executables without this option were:

   text    data     bss     dec     hex filename
  97296    5088   21408  123792   1e390 base_sp.exe
 110720    5056   21008  136784   21650 hello.exe
  34240    4512   17296   56048    daf0 minimum.exe
 543344    8992   32896  585232   8ee10 fileio.exe
 116304    5168   21520  142992   22e90 nsecs.exe
 194352    5456   22000  221808   36270 paranoia.exe
 101152    5088   21440  127680   1f2c0 ticker.exe
  99472    5120   24848  129440   1f9a0 unlimited.exe
 847312   24960   28512  900784   dbeb0 cxx_iostream.exe
 200672    5680   21584  227936   37a60 cdtest.exe
 193312    5584   23232  222128   363b0 capture.exe

The size of the sample executables with this option enabled were:

   text	   data	    bss	    dec	    hex	filename
  89376	   5056	  21360	 115792	  1c450	base_sp.exe
 101872	   5008	  20944	 127824	  1f350	hello.exe
  27584	   4464	  17232	  49280	   c080	minimum.exe
 527520	   8960	  32560	 569040	  8aed0	fileio.exe
 109424	   5136	  21456	 136016	  21350	nsecs.exe
 185984	   5424	  21952	 213360	  34170	paranoia.exe
  93968	   5056	  21376	 120400	  1d650	ticker.exe
  90944	   5072	  24784	 120800	  1d7e0	unlimited.exe
 176832	   5600	  21248	 203680	  31ba0	cxx_iostream.exe
 184480	   5536	  21504	 211520	  33a40	cdtest.exe
 183376	   5520	  23168	 212064	  33c60	capture.exe

---

 c/src/lib/libbsp/m68k/gen68340/make/custom/gen68340.cfg | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/c/src/lib/libbsp/m68k/gen68340/make/custom/gen68340.cfg b/c/src/lib/libbsp/m68k/gen68340/make/custom/gen68340.cfg
index 5b6c40b..18eda2b 100644
--- a/c/src/lib/libbsp/m68k/gen68340/make/custom/gen68340.cfg
+++ b/c/src/lib/libbsp/m68k/gen68340/make/custom/gen68340.cfg
@@ -13,3 +13,6 @@ CPU_CFLAGS = -mcpu=cpu32
 
 # optimize flag: typically -O2
 CFLAGS_OPTIMIZE_V = -O2 -g -fomit-frame-pointer
+CFLAGS_OPTIMIZE_V += -ffunction-sections -fdata-sections
+
+LDFLAGS = -Wl,--gc-sections